Fun build, but hardly worth going for. I don't see how Cho'Gath can get THIS fed. Possible but better off getting someone else fed.

I don't think Mejei's is worth it at all, because you can just build frozen heart for cdr and I never had a problem not having enough ap even with basic items like RoA.

Sword of the Occult offers nothing special for Cho'Gath. Attack damage? Nothing scales with ad on him, as his e scales off ap. Also, I never feel too slow with Cho'Gath with the range on his q. Also with your masteries Cho'Gath will be extremely squishy early game, which is where you would want to get fed for this build. Not very viable but for fun why not.